Advance Invoices & VAT: Correct Accounting and Settlement in Switzerland

For larger projects or expensive services, it's common to issue one or more advance invoices before the final invoice. What works well in practice becomes a stumbling block at VAT settlement time — especially when the advance payment and service delivery fall into different accounting periods. This article shows you how to handle advance invoices correctly from a tax perspective, so VAT settlement doesn't become guesswork.

When does VAT liability arise for advance payments?

The Swiss Federal Tax Administration (SFTA) distinguishes between two accounting methods when determining the timing of tax liability:

• Invoiced amounts (accrual method): VAT becomes due when you issue the invoice — even on an advance invoice, before you've fully delivered the service.
• Cash amounts received (cash method): VAT only arises when payment actually arrives in your account.

Most Swiss SMEs use the accrual method. This means: if you issue an advance invoice for CHF 5,000 plus 8.1% VAT on 15 June, the CHF 405 VAT must be declared in the accounting period in which the invoice is dated — regardless of whether the customer pays immediately or three weeks later.

Practical example: carpentry firm with two-stage billing

A carpentry firm in Bern receives an order for a kitchen installation valued at CHF 24,000 (excl. VAT). They agree on:

1. Advance payment upon order: CHF 8,000 + 8.1% VAT = CHF 8,648
2. Final invoice upon delivery: CHF 16,000 + 8.1% VAT = CHF 17,296

Under the accrual method, they must declare the CHF 648 VAT from the advance invoice in the quarter when it was issued — even if the customer doesn't pay until the following quarter.

The most common accounting errors with advance invoices

Error 1: Declaring VAT only with the final invoice

Many bookkeepers accidentally record the VAT from the advance invoice only when issuing the final invoice. This shifts the tax liability to the wrong period and can result in penalties, interest and corrective demands during an SFTA VAT audit.

Correct entry (accrual method, CHF 8,000 + 8.1% VAT):

Account (Chart of Accounts)	Debit	Credit
Accounts Receivable	CHF 8,648	—
Advance Payments Received (Liability)	—	CHF 8,000
VAT Payable (Output Tax)	—	CHF 648

When payment arrives, the accounts receivable position is cleared. When the final invoice is issued, the advance payment liability is reversed and the remaining amount is settled.

Error 2: Not stating the VAT rate on the advance invoice

Under Swiss VAT law, invoices — including advance invoices — must show the applied tax rate and the tax amount, provided you're VAT-registered. Without these details, your customer cannot claim input tax recovery. The Swiss invoice template — all required fields in one place explains comprehensively how to capture all mandatory invoice information.

Error 3: Recording advance payment as revenue instead of a liability

An advance payment received is not yet realized revenue — the service hasn't been delivered. Therefore, record the net amount on an account for advance payments received (liability), not directly on the revenue account. Revenue is only realized when the service is delivered and transferred to the sales account on the final invoice.

What belongs on an advance invoice

An advance invoice is a full invoice and must contain all legally required information. In addition, it should clearly state:

• The notation "Advance Invoice" or "Partial Payment," prominently in the title or subject line
• The total contract value (optional but recommended for transparency)
• The amount invoiced to date
• The billing basis (e.g., "50% of agreed contract value per Quote No. 2026-041")
• The applicable VAT rate and the tax amount
• Your QR-IBAN for payment via QR-bill

For VAT-registered invoices in Switzerland, the standard rate of 8.1% generally applies, except for services subject to the reduced rate of 2.6% (e.g. food, books) or the special rate of 3.8% (accommodation). For a compact overview of all current rates and special rules, see Swiss VAT basics 2026 — rates, duties and special rules.

Advance invoices under the cash method: What changes

If you use the cash method, you declare VAT only when the customer actually pays. This relieves cash flow pressure during long payment terms. The booking logic remains similar; the key difference is that VAT liability arises only upon payment — not upon invoicing.

Switching between methods is possible but requires formal notification. If you're considering a method change, discuss it with your accountant before taking any independent action.

Correctly reconciling advance payments in the final invoice

The advance invoice must be clearly stated and reconciled in the final invoice. This means:

1. Show the full contract value as a gross amount.
2. Deduct the advance payments already made (net amount) individually.
3. Calculate the remaining VAT only on the outstanding net balance.
4. Reference the invoice numbers of the advance invoices in the final invoice.

This approach prevents VAT from being declared twice — an error the SFTA regularly identifies during audits. If you want to create the final invoice directly, you can do so conveniently via the SnapBill app, which supports advance payments as a deductible line item.

At a glance

• Under the accrual method, VAT liability arises on the invoice date — even for advance invoices.
• Under the cash method, VAT is due only upon payment receipt.
• Advance payments belong on a liability account, not directly in revenue.
• Every advance invoice needs all VAT mandatory information including tax rate and amount.
• In the final invoice, advance payments are deducted net; VAT is calculated only on the remaining balance.
• Reference the invoice numbers of advance invoices in the final invoice.